Natural plant based warming and soothing pack Natural plant extracts for warming and calm: flax seeds retain warmth for an extended period and release heat after microwave heating to relax stiff neck and shoulders. Lavender provides a mild natural fragrance that soothes nerves and can support a bedtime routine, helping with office fatigue and insomnia. Ergonomic, versatile size: 44 × 21 cm design fits the neck, shoulders, arms, and knees. Suitable for people who sit for long periods to relieve stiffness, for those who exercise to dissipate muscle lactic acid, and for women during menstruation to warm the waist and abdomen and relieve chills. Hot and cold compress dual mode: Hot mode activates the flax seed warmth to quickly open meridians and relieve stiffness in the neck and shoulder area. Cold mode preserves cooling for sprains and swelling, making it suitable for sports strains and swelling. Safe, durable construction: One side is velvety soft and skin friendly, gentle on sensitive skin, while the other side uses breathable mesh fabric to dissipate heat evenly and prevent sweating, ensuring comfort during extended use. strength sewing technology provides durability, and repeated hot and cold applications resist deformation and pilling. Practical use scenarios: At the desk: place on the neck and shoulders after long hours of sitting to relieve stiffness and promote relaxation. After exercise: use as a hot pack to help dissipate lactic acid and ease tired muscles. Menstrual comfort: wrap around the waist and abdomen to provide warmth and help relieve chills.